See the journey of Ubuntu. It is a robust OS which has better security and safety features for safe data and programs.

Version	Code name	Docs	Release date	End of life date
Ubuntu 11.10	Oneiric Ocelot	Tech / Rel	October 13, 2011	May 9, 2013
Ubuntu 11.04	Natty Narwhal	Tech / Rel	April 28, 2011	October 28, 2012
Ubuntu 10.10	Maverick Meerkat	Tech / Rel	October 10, 2010	April 10, 2012
Ubuntu 10.04	Lucid Lynx (Desktop)	Changes	February 16, 2012	May 9, 2013
Ubuntu 9.10	Karmic Koala	Tech / Rel	October 29, 2009	April 30, 2011
Ubuntu 9.04	Jaunty Jackalope	Tech / Rel	April 23, 2009	October 23, 2010
Ubuntu 8.10	Intrepid Ibex	Rel	October 30, 2008	April 30, 2010
Ubuntu 8.04.4 LTS	Hardy Heron (Server)	Changes	January 28, 2010	May 9, 2013
Ubuntu 8.04.3 LTS	Hardy Heron	Changes	July 16, 2009
Ubuntu 8.04.2 LTS	Hardy Heron	Changes	January 22, 2009
Ubuntu 8.04.1 LTS	Hardy Heron	Hardy Heron	July 3, 2008
Ubuntu 8.04 LTS	Hardy Heron	Hardy HeronRel	April 24, 2008
Ubuntu 8.04	Hardy Heron (Desktop)	Rel	April 24, 2008	May 12, 2011
Ubuntu 7.10	Gutsy Gibbon	Rel	October 18, 2007	April 18th, 2009
Ubuntu 7.04	Feisty Fawn	Rel	April 19, 2007	October 2008
Ubuntu 6.10	Edgy Eft	Rel	October 26, 2006	April 2008
Ubuntu 6.06.2 LTS	Dapper Drake (Server)		January 21, 2008	June 1, 2011
Ubuntu 6.06.1 LTS	Dapper Drake		August 10, 2006
Ubuntu 6.06 LTS	Dapper Drake	Rel	June 1, 2006
Ubuntu 6.06	Dapper Drake (Desktop)	Rel	June 1, 2006	July 14, 2009
Ubuntu 5.10	Breezy Badger	Rel / Rel	October 12, 2005	April 2007
Ubuntu 5.04	Hoary Hedgehog		April 8, 2005	October 2006
Ubuntu 4.10	Warty Warthog		October 26, 2004	April 2006